Industrial property landlords in the U.S. enjoyed steady occupancy gains in 2012 amid expansions in the manufacturing and e-commerce industries. Warehouse users, manufacturers and other industrial tenants soaked up roughly 50 million square feet in the second half of the year, lowering the average vacancy rate nationwide to 12.4%, a 110-basis-point improvement from a year earlier, according to New York-based commercial property watcher Reis. On